\documentclass[a4paper]{article}
%\documentclass[a4paper]{book}

\include{preambule}

\begin{document}
\maketitle
\begin{center}
\includegraphics[scale=0.6]{img/first.png}
\end{center}
\newpage
\tableofcontents
\newpage
\input{introduction}
\input{partie1}
\input{partie2}
\input{partie3}
\input{partie5}
\input{partie4}

\input{conclusion}

\end{document}
